gmx.com offers up to 10 email aliases at a time for free. So of you're signing up for something from which you don't want to receive emails, use one of the alia

gmx.com offers up to 10 email aliases at a time for free. So of you're signing up for something from which you don't want to receive emails, use one of the aliases until it starts getting spam. Then delete it and create a new one.